Musk unveils prototype of Tesla's humanoid robot, to cost less than a car

Tesla CEO Elon Musk unveiled a prototype of humanoid robot, dubbed 'Optimus', during the company's AI Day event on Saturday. During the event, the robot walked onstage, waved hello and danced. "The robot can actually do a lot more...We just didn't want it to fall on its face," said Musk, adding that it's expected to cost less than a car.